Sanding shoe and clip therefor

ABSTRACT

A sanding shoe having an over-center type clip for clamping an abrasive sanding sheet to the end of the shoe. The shoe itself is fabricated from rubber having a metal panel or insert molded into it near the upper surface. The rubber material forms an upstanding rib at the end of the shoe with bevelled inside surfaces. The ends of the abrasive sheet come over the end ribs and it is clamped thereto by a resilient U-shaped metal clamp which is held in the clamped position by an over-center movement.

United States Patent [191 Sjostrand 11'] 3,822,518 [451 July 9,1974

[ SANDING SHOE AND CLIP THEREFOR [75] Inventor: Gerald D. Sjostrand,Fresno, Calif.

[73] Assignee: Rodac Pneumatic Tools, bos

Angeles, Calif. [22] Filed: Sept. 7, 1972 [21] App]. No.: 286,937

[52] US. Cl. 51/386 [51] Int. Cl B24d 17/00 [58] Field of Search 5l/358,382-387, 51/359 [56] References Cited UNITED STATES PATENTS 2,077,4054/l937 Enge 51/385 2,509,561 5/l950 Drenel SI/386 7/1955 Champayne5l/359 Yelpo et al. 51/385 Thomas 51/386 Primary Examiner-Othell M.Simpson Attorney, Agent, or Firm-Herzig & Walsh [5 7] ABSTRACT A sandingshoe having an over-center type clip for clamping an abrasive sandingsheet to the end of the shoe. The shoe itself is fabricated from rubberhaving a metal panel or insert molded into it near the upper surface.The rubber material forms an upstanding rib at the end of the shoe withbevelled inside surfaces. The ends of the abrasive sheet come over theend ribs and it is clamped thereto by a resilient U-shaped metal clampwhich is held in the clamped position by an over-center movement.

14 Claims, 6 Drawing Figures 1 SANDING SHOE AND CLIP THEREFOR SUMMARY OFTHE INVENTION The invention relates to a shoe for sanding tools havingend clips for clamping a sheet of abrasive material,

such as abrasive paper, to the shoe.

In the prior art, there are various known types of clips for clamping anabrasive paper sheet to a reciprocatable sanding shoe. Typically, theabrasive sheet is brought up over the ends of the shoe and clamped tothe shoe. Certain improvements are embodied in the clip of the hereininvention for the purpose of realizing certain objectives. The shoeitself is molded of rubber with a metal plate molded into it in theupper part for additional rigidity. At the ends of the shoe, there areformed ribs extending above the top surface of the shoe. These ribs haveslanting or bevelled inside surfaces. The ribs are integral with therubber of the shoe itself. The clip is in the form of a resilientU-shaped member, the legs of which are secured to the shoe and the bightof which has an edge part with teeth adapted for clamping the end of theabrasive sheet between it and the end rib. This improved constructionenables certain objectives to be realized. A primary object is toprovide a construction which will insure adequate clamping of the end ofthe abrasive sheet in such a way that it will be held without tearingloose. This object is accomplished by reason of the resiliency of theend rib and its bevelled surface against which the end of the sheet isclamped. I A further object is to provide a simple clip or clampingmeans which is economical and easy to fabricate since it simply takesthe form of a resilient U-shaped member having its legs secured to thetop surface of the shoe and which is provided with an over-centermovement mechanism for urging it'into clamping position, wherein itclamps the end of the abrasive sheet.

BRIEF DESCRIPTION OF THE DRAWINGS Further objects and additionaladvantages of the invention will become apparent from the followingdetailed description and annexed drawings, wherein:

FIG. 1 isa plan view of a preferred form of the invention; I

FIG.2 is a perspective view of one end of the form of the inventionshown in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 of F IG. 2; 1

FIG. 4 is a sectional view taken along line 4-4 of FIG.- 3;

FIG. Sis a perspective view similar to that of FIG. 2 showing theover-center latching mechanism in the release position; and

FIG. 6 is a sectional view taken along the line 6-6 of FIG. 5.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the drawings, shoe 10 is ofrectangular, elongated configuration and comprises member 12 preferablyfabricated from rubber having a metal plate 14 molded into it, as may beseen in FIG. 3. Plate 14 is molded in near the top surface of member 12.Numerals 16 and 18 designate screws, having heads molded into the shoeas shown in FIG. 3. Screws l6 and 18 are for attaching or securing thehandle to the shoe.

At the ends of the shoe, rubber member 12 is formed to provide ribs onthe upper side: thereof, such as indicated by rib 24 in FIG. 3. Theseribs are integral with the shoe itself, being fabricated as a part ofthe rubber material. The top or inner surface of the ribs has a slant orbevel as designated at 26 for rib 24.

FIGS. 2 through 6 show one of the clamping devices at one end of theshoe. The clamping devices are similar at both ends. Oneof the clampingdevices is designated generally at 30. Numeral 32 designates a resilientmetal clamping member of U-shaped configuration having a bight part 34and legs 36 and 38. The legs are secured to the top. surface of shoe 10by rivets 40 and 42. Bight part 34 has downtumedl edge 44 having teethin it adapted to bite into and engage the end part of an abrasive sheet50 which may be paper or the like.

Numeral 54'designates a shaft joumalling member which has a horizontalfoot 56 secured to the top surface of shoe 10 by rivets 58 and 60. Ithas an upstanding part 62 which is bent over as shown at 64 in FIG. 5 toform a joumalling receptacle which receives and journals theintermediate part of shaft 70. The intermediate part 72 is in the formof a crank and is journalled in the journal means 54. At one end ofshaft 70, there is formed an operating handle 72 having a bend in it tofacilitate fastening it. The parts of the shaft adjacent to crank part72 as designated at 74 and 76 normally bear on legs 36 and 38 of clipmember 32 as may be seen in FIG. 2. Member 32 is resilient and whenunrestrained takes an open position in which edge 44 is spaced from rib24 asmay be seen in FIG. 5. In the open position, handle 72 ispositioned as shown in FIGS. 5 and 6. When handle 72:is grasped androtated in a clockwise direction, from the position as shownin FIG. 6,it can be moved into a position as shown in FIGS. 2 and 3 wherein thehandle comes down onto the top surface of shoe 10. Portions 74 and 76 ofshaft 70 move in a clockwise direction and bear against legs 36 and 38of clip 32 adjacent to bight 34. By camming action, they force the clipdown into the clamping position. In this position, edge 44 and the teethon it bite into the end part of abrasive sheet material 50 and thenengage into the rubber of rib 24 through bevelled surface 26, as may beseen. This holds the abrasive material securely in position andeliminates tearing loose of the abrasive material because of theresiliency of material 24 and its bevelled surface 26., the end of theabrasive sheet being between this surface and edge 44 of the clip.

From the foregoing, those skilled in the art will readily understand thenature and construction of the inventionand the manner in which itrealizes the objects as set forth in the foregoing.

The foregoing disclosure is representative of a preferred form of theinvention and is to be interpreted in an illustrative rather than alimiting sense, the invention to be accorded the full scope of theclaims appended hereto.

What is claimed is:

1. A sanding tool, comprising:

a sanding shoe having upper and lower major surfaces and first andsecond spaced apart ends, an inwardly sloping beveled surface ofresilient material being formed on said upper major surface adjacenteach of said shoe ends;

a pair of resilient clamping members having inner and outer ends, adownwardly extending clamping edge being formed on each of said clampingmember outer ends, said clamping members having their inner ends securedon said shoe and being mounted over opposite ends of the upper majorsurface of said shoe, each of said clamping members having apredetermined shape to assume when unbent a position in which itsclamping edge overlies and is spaced apart above said beveled surfaceformed on said shoe end with which it is associated; and

selectively releasable latch means for locking said clamping memberswith their clamping edges in tight engagement with said beveled surfaceswhereby an abrasive sheet of material may be secured on said shoe toextend between the ends thereof across said shoes major lower surface byfolding opposite ends of the abrasive sheet over the beveled surface onopposite ends of said shoe and then locking said latch means.

2. The invention defined in claim 1 wherein said clamping edges havedownwardly extending teeth formed thereon positioned to engage saidbeveled surfaces when said latch means is locked.

3. The invention defined in claim 1 wherein said beveled surfaces aremade of rubber. 4 The invention defined in claim 1 wherein said shoe ismade of a substantially rigid interiorly positioned reinforcing platesurrounded by rubber, said rubber defining the outer surfaces of saidshoe.

5. The invention defined in claim 1 wherein each of said clamping edgesextends substantially at a right angle to the one of said beveledsurfaces with which it is associated.

6. The invention defined in claim 1 wherein each of said clampingmembers is a substantially U-shaped piece of spring metal having a pairof spaced apart mutually parallel legs connected on their outer ends bya bight portion, said bight portion defining the outer end of saidclamping member and the inner ends of said legs defining the inner endof said clamping member.

7. The invention defined in claim 1 wherein said latch means includes atwo position over center actuating mechanism associated with each ofsaid clamping members, each of said over center actuating mechanismsbeing mounted on the upper major surface of said shoe in engagement withits associated one of said clamping members and being selectivelymovable between a locked and unlocked position, each of said over centeractuating mechanisms being operable in its locked position to depressand hold the clamping member it engages with its clamping edge inengagement with the associated one of said beveled surfaces and in itsunlocked position permitting said clamping member to assume its unbentshape.

8. The invention defined in claim 6 wherein said latch means includes atwo position over center actuating mechanism associated with each ofsaid clamping members, each of said over center actuating mechanismsbeing mounted on the upper major surface of said shoe in engagement withits associated one of said clamping members and being selectivelymovable between a locked and unlocked position, each of said over centeractuating mechanisms being operable in its locked position to depressand hold the clamping member it engages with its clamping edge inengagement with the associated one of said beveled surfaces and in itsunlocked position permitting said clamping member to assume its unbentshape.

9. The invention defined in claim 8 wherein each of said over centeractuating mechanisms is formed by a crank member rotatably mounted onsaid shoe, said crank members having portions offset from their axes ofrotation which may be selectively rotated downwardly'substantiallysimultaneously into engagement with each of the legs of the one of saidclamping members with which it is associated whereby to force saidclamping member into engagement with its associated one of said beveledsurfaces.

10. The invention defined in claim 1 including screws having their headsrigidly secured and imbedded in said shoe with the shaft portions ofsaid screws extending upwardly from the upper major surface of said shoeso that a sanding tool handle may be secured thereon.

11. The invention defined in claim 1 wherein:

each of said clamping edges extends substantially at a right angle tothe one of said beveled surfaces with which it is associated; and

each of said clamping edges has downwardly extending teeth formedthereon positioned to engage the the one of said beveled surfaces withwhich it is associated when said latch means is locked.

12. The invention defined in claim 11 wherein said latch means includesa two position over center actuating mechanism associated with each ofsaid clamping members, each of said over center actuatingmechanisms'being mounted on the upper major surface of said shoe inengagement with its associated one of said clamping members and beingselectively movable between a locked and unlocked position, each of saidover center actuating mechanisms being operable in its locked positionto depress and hold the clamping member it engages with its clampingedge in engagement with the associated one of said beveled surfaces andin its unlocked position permitting said clamping member to assume itsunbent shape.

13. The invention defined in claim 12 wherein said shoe is made of asubstantially rigid interiorly positioned reinforcing plate surroundedby rubber, said rubber defining the outer surfaces of said shoe.

14. The invention defined in claim 11, wherein said beveled surfaces aremade of rubber.

1. A sanding tool, comprising: a sanding shoe having upper and lowermajor surfaces and first and second spaced apart ends, an inwardlysloping beveled surface of resilient material being formed on said uppermajor surface adjacent each of said shoe ends; a pair of resilientclamping members having inner and outer ends, a downwardly extendingclamping edge being formed on each of said clamping member outer ends,said clamping members having their inner ends secured on said shoe andbeing mounted over opposite ends of the upper major surface of saidshoe, each of said clamping members having a predetermined shape toassume when unbent a position in which its clamping edge overlies and isspaced apart above said beveled surface formed on said shoe end withwhich it is associated; and selectively releasable latch means forlocking said clamping members with their clamping edges in tighteNgagement with said beveled surfaces whereby an abrasive sheet ofmaterial may be secured on said shoe to extend between the ends thereofacross said shoe''s major lower surface by folding opposite ends of theabrasive sheet over the beveled surface on opposite ends of said shoeand then locking said latch means.
 2. The invention defined in claim 1wherein said clamping edges have downwardly extending teeth formedthereon positioned to engage said beveled surfaces when said latch meansis locked.
 3. The invention defined in claim 1 wherein said beveledsurfaces are made of rubber.
 4. The invention defined in claim 1 whereinsaid shoe is made of a substantially rigid interiorly positionedreinforcing plate surrounded by rubber, said rubber defining the outersurfaces of said shoe.
 5. The invention defined in claim 1 wherein eachof said clamping edges extends substantially at a right angle to the oneof said beveled surfaces with which it is associated.
 6. The inventiondefined in claim 1 wherein each of said clamping members is asubstantially U-shaped piece of spring metal having a pair of spacedapart mutually parallel legs connected on their outer ends by a bightportion, said bight portion defining the outer end of said clampingmember and the inner ends of said legs defining the inner end of saidclamping member.
 7. The invention defined in claim 1 wherein said latchmeans includes a two position over center actuating mechanism associatedwith each of said clamping members, each of said over center actuatingmechanisms being mounted on the upper major surface of said shoe inengagement with its associated one of said clamping members and beingselectively movable between a locked and unlocked position, each of saidover center actuating mechanisms being operable in its locked positionto depress and hold the clamping member it engages with its clampingedge in engagement with the associated one of said beveled surfaces andin its unlocked position permitting said clamping member to assume itsunbent shape.
 8. The invention defined in claim 6 wherein said latchmeans includes a two position over center actuating mechanism associatedwith each of said clamping members, each of said over center actuatingmechanisms being mounted on the upper major surface of said shoe inengagement with its associated one of said clamping members and beingselectively movable between a locked and unlocked position, each of saidover center actuating mechanisms being operable in its locked positionto depress and hold the clamping member it engages with its clampingedge in engagement with the associated one of said beveled surfaces andin its unlocked position permitting said clamping member to assume itsunbent shape.
 9. The invention defined in claim 8 wherein each of saidover center actuating mechanisms is formed by a crank member rotatablymounted on said shoe, said crank members having portions offset fromtheir axes of rotation which may be selectively rotated downwardlysubstantially simultaneously into engagement with each of the legs ofthe one of said clamping members with which it is associated whereby toforce said clamping member into engagement with its associated one ofsaid beveled surfaces.
 10. The invention defined in claim 1 includingscrews having their heads rigidly secured and imbedded in said shoe withthe shaft portions of said screws extending upwardly from the uppermajor surface of said shoe so that a sanding tool handle may be securedthereon.
 11. The invention defined in claim 1 wherein: each of saidclamping edges extends substantially at a right angle to the one of saidbeveled surfaces with which it is associated; and each of said clampingedges has downwardly extending teeth formed thereon positioned to engagethe the one of said beveled surfaces with which it is associated whensaid latch means is locked.
 12. The invention defined in claim 11wherein said latch means includes a two position over center actuatingmechAnism associated with each of said clamping members, each of saidover center actuating mechanisms being mounted on the upper majorsurface of said shoe in engagement with its associated one of saidclamping members and being selectively movable between a locked andunlocked position, each of said over center actuating mechanisms beingoperable in its locked position to depress and hold the clamping memberit engages with its clamping edge in engagement with the associated oneof said beveled surfaces and in its unlocked position permitting saidclamping member to assume its unbent shape.
 13. The invention defined inclaim 12 wherein said shoe is made of a substantially rigid interiorlypositioned reinforcing plate surrounded by rubber, said rubber definingthe outer surfaces of said shoe.
 14. The invention defined in claim 11,wherein said beveled surfaces are made of rubber.